California's Mammoth Mountain provides a case study on the uncertainty of the ski business, and how global warming threatens to make it even more unpredictable.
Mammoth Lakes, California and the rest of the ski industry face climate change. Also, Obama nominates a recreation industry magnate as Secretary of the Interior, the information age renders remote archeological sites increasingly accessible, Lake Mead reveals a long-sunken ghost town, scientists track the surprising and increasingly urban movement of mountain lions, and more.